And they still push 7.7 TH reliably, at about 1200W at the wall, 240V circuit. I don't necessarily recommend that second setting as Canaan targets the chips to 90C, but it works well for me...
I am curious if you know how to change the targeted temp for the S9's (I think it is the July batch - hardware 16.8.1.3, logic S9_V2.30). My garage is getting cold here in Wisconsin and does not seem to be cranking up the hash to increase the temp. The boards are running around 60c now and in the summer it was around 80. I know there is a cgi-bin/minerAdvanced.cgi hidden menu (currently at 550.00M) but it says it will be taken off line for 3 hours if I change it... Does anyone have experience with this?